Island



(R0 ModeL) I. L. HOLMES.

ADJUSTABLE STOP FOR GALIPERS. No. 315,621. Patented Apt-14,1885.

W1TNE5EE5. INVENTDR Unrrnn Sterne n rnrwr rrrcn.

IRVING L. HOLMES, OF PROVIDENCE, RHODE ISLAND.

ADJUSTABLE STOP FOR CALlPERS.

SPECIFIGATION forming part of Letters Patent No. 315,621, dated April it, 1885.

I Application filed August 26, 1884. (No model.)

To all whom it may concern.-

Be it known that I, IRVING L. HOLMES, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Adjustable Stops for Calipers, &c.; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters I or figures of reference marked thereon, which form a part of this specification.

My invention relates to calipers and dividers or other analogous instruments; and it consists, essentially, of a shoe or gib which serves as a gage or stop adapted to be adj ustably secured to the quadrant or screw.

The object of the invention is to provide calipers, &c., with means for accurately resetting after the instrument has been removed from the object measured or gaged. Heretofore, so far as I am aware, this has been accomplished by means of a corresponding or proportionate rearward elongation of the legs or wings approximating an form, whereby the dimension of the article or object embraced between the ends of the wingsis shown at the opposite end of the instrument.

Another device consists in combining a.

graduated quadrant with one wing, the other wing terminating rearward in a pointer. Instruments thus, provided are designed to indicate the dimensions of the object embraced by them. Practically, however, all such devices render the instrument unreliable after the wings have been worn or ground off, especially so when applied to dividers. In the present invention these disadvantages are overcome, the device being equally applicable to inside and outside calipers, as well as dividers.

In the accompanying sheet of drawings, Figure 1 represents an ordinary pair of outside calipers provided with the adjustable stop secured to the quadrant between the wings, another stop also being shown mounted upon the outer end of the quadrant, the free end of the wings represented as gaging the thickness of a recessed blank. Figs. 2, 3, and 4 represent modified forms of the stop.

The following is a description of the invention, including the manner of its application and use.

Again referring to the drawings, A designates a pair of common calipers having wings or legs a a and quadrant B, with its adjusting-screw r, nut 0, and spring 6, as usual.

S designates a sliding gib or stop adapted to be adjustably secured to said quadrant by means of the bindingscrew' s.

In Fig. 2 the stop is represented as being adapted to fit over a quadrant having beveled edges.

Fig. 3 represents a modified form of the stop, wherein books i serve to retain it laterally upon a quadrant having square edges, and Fig. 4 represents a cross-sectional view of a slotted quadrant, wherein a bolt, 3* passes and through the stop 8. A nut, 8 serves to secure the stop in position upon the quadrant.

The use and operation of the invention may be described thus: Wishing to obtain the thickness hof the blank H, Fig. l, the operator places the calipers over the rim of the blank against the web it, as shown, after which the leg a is secured to the quadrant B by means of the binding-screw w, (shown dotted,) as usual. The adj Listing-nut 0 may also be employed when greater accuracy is required. The inner stop .9, having previously been loosened, is now made to engage with the inner edge of the leg a, and is secured in place by means of the binding-screw 8 thereof. The screw 10 now being loosened permits the calipers to be removed from said blank, (see dotted position,) after which the leg at is again made to bear against the stop, and secured, if necessary, by the said screw to, thereby adapting the space it between the ends of the wings to be measured. Itis obvious that any distance (within the limit of the instrument) may be thus obtained, the stop being adapted to be secured at any point along the quadrant for the purpose. An additional advantage is possessed by instruments provided with this inventionviz., that by means of both the inner.and outer stops, Fig. l, the calipers can be used for two or more dimensions without readjustment. The longest distance being from the leg a, to the leg a when the latter rests againt the outer stop, the shortest when resting against the inner stop, and the interme diate distances being gaged by means of the screw w only. It is also apparent that for inside calipers provided with a quadrant, &o., the stop 8 would be used against the outer surface or edge of the wing.

I.do not claim, broadly, herewith means for indicating, in calipers or dividers, the set distance between the ends of the wings or legs; but

What I do claim, and desire to secure by Letters Patent, is-

1. In calipers or other analogous instruments of precision, the combination, with the legs or wings and the quadrant adjustably secured thereto, of one or more stops adjustably mounted upon the quadrant,substantially as shown, and for the purpose set forth.

2. The combination, with the are or quadrant B, adj ustably secured to the legs or'wings a a, of the independently-adjustable stop 3, 20 mounted upon said quadrant,substantially as shown and set forth. v

3. As an improved article of manufacture, calipers composed of legs or wings a a, jointed or otherwise connected at top, are or quad rant B, adjustably secured to said legs by means of the spring e, nut 0, and bindingscrew w, and further consisting of the sliding stop 8, adjustably secured to the quadrant, all combined and arranged substantially as shown, and for the purpose herein set forth.

In testimony whereof I have affixed my signature in presence of two witnesses.

IRVING L. HOLMES.

Witnesses:

CHARLES HANNIGAN, WM. R. DUTEMPLE. 

